diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml index ea48100f89..39241f5e59 100644 --- a/.github/workflows/test.yml +++ b/.github/workflows/test.yml @@ -557,26 +557,26 @@ jobs: - if: ${{ env.GO == 1 }} run: make -C examples/${{ matrix.example.path }} build -# mqtt_dashboard_examples: -# runs-on: ubuntu-latest -# strategy: -# fail-fast: false -# matrix: -# example: -# - path: -# name: ${{ matrix.example.path }} -# env: -# GO: 0 -# steps: -# - uses: actions/checkout@v3 -# with: { fetch-depth: 2 } -# - run: | -# if ./test/match_changed_files.sh '^src|examples/mqtt-dashboard/device|^examples/${{ matrix.example.path }}'; then -# echo GO=1 >> $GITHUB_ENV -# sudo apt -y update && sudo apt -y install gcc-arm-none-eabi -# fi -# - if: ${{ env.GO == 1 }} -# run: make -C examples/${{ matrix.example.path }} build + mqtt_dashboard_examples: + runs-on: ubuntu-latest + strategy: + fail-fast: false + matrix: + example: + - path: rp2040/pico-rndis-device + name: ${{ matrix.example.path }} + env: + GO: 0 + steps: + - uses: actions/checkout@v3 + with: { fetch-depth: 2 } + - run: | + if ./test/match_changed_files.sh '^src|examples/mqtt-dashboard/device|^examples/${{ matrix.example.path }}'; then + echo GO=1 >> $GITHUB_ENV + sudo apt -y update && sudo apt -y install gcc-arm-none-eabi + fi + - if: ${{ env.GO == 1 }} + run: make -C examples/${{ matrix.example.path }} build dual_examples: runs-on: ubuntu-latest diff --git a/examples/rp2040/pico-rndis-device/CMakeLists.txt b/examples/rp2040/pico-rndis-device/CMakeLists.txt new file mode 100644 index 0000000000..a43355d1be --- /dev/null +++ b/examples/rp2040/pico-rndis-device/CMakeLists.txt @@ -0,0 +1,28 @@ +cmake_minimum_required(VERSION 3.13) +include(pico-sdk/pico_sdk_init.cmake) + +project(firmware) +pico_sdk_init() + +add_executable(firmware + main.c + usb_descriptors.c + mongoose.c + net.c + pico-sdk/lib/tinyusb/lib/networking/rndis_reports.c) + +target_include_directories(firmware PUBLIC + . + pico-sdk/lib/tinyusb/lib/networking) + +target_link_libraries(firmware pico_stdlib hardware_spi tinyusb_device) +pico_add_extra_outputs(firmware) # create map/bin/hex file etc. + +pico_enable_stdio_usb(firmware 0) # Route stdio +pico_enable_stdio_uart(firmware 1) # to the UART + +# Mongoose build flags +add_definitions(-DMG_ENABLE_TCPIP=1) +add_definitions(-DMG_ENABLE_FILE=0) + +# Example build options diff --git a/examples/rp2040/pico-rndis-device/Makefile b/examples/rp2040/pico-rndis-device/Makefile new file mode 100644 index 0000000000..08adf5f258 --- /dev/null +++ b/examples/rp2040/pico-rndis-device/Makefile @@ -0,0 +1,20 @@ +RM = rm -rf +MKBUILD = test -d build || mkdir build +ifeq ($(OS),Windows_NT) + RM = cmd /C del /Q /F /S + MKBUILD = if not exist build mkdir build +endif + +all example: + true + +build: pico-sdk + $(MKBUILD) + cd build && cmake -G "Unix Makefiles" .. && make + +pico-sdk: + git clone --depth 1 -b 1.4.0 https://github.com/raspberrypi/pico-sdk $@ + cd $@ && git submodule update --init + +clean: + $(RM) pico-sdk build diff --git a/examples/rp2040/pico-rndis-device/README.md b/examples/rp2040/pico-rndis-device/README.md new file mode 100644 index 0000000000..dd4caeee85 --- /dev/null +++ b/examples/rp2040/pico-rndis-device/README.md @@ -0,0 +1,30 @@ +# Remote MQTT Device on an RP2040 + +Your headless Raspberry Pi Pico-based hardware can also be a remote gadget when you connect it to your computer via USB + +For the USB specifics, see this related tutorial at https://mongoose.ws/tutorials/rp2040/pico-rndis-dashboard/ + +See this tutorial to control your device: https://mongoose.ws/tutorials/mqtt-dashboard/ + +For this to work, you need your computer to act as a router (gateway) and NAT for your device. + +## Linux setup + +Enable "masquerading"; the quick and simple options are: + +``` bash +sudo iptables --flush +sudo iptables --table nat --flush +sudo iptables --delete-chain +sudo iptables --table nat --delete-chain + +# Do masquerading +sudo iptables -t nat -A POSTROUTING -o yourifc -j MASQUERADE +# enable routing +sudo echo 1 > /proc/sys/net/ipv4/ip_forward +``` + +Where `yourifc` is the interface that is connected to your network + +## MacOS setup + diff --git a/examples/rp2040/pico-rndis-device/hal.h b/examples/rp2040/pico-rndis-device/hal.h new file mode 100644 index 0000000000..c21379869d --- /dev/null +++ b/examples/rp2040/pico-rndis-device/hal.h @@ -0,0 +1,11 @@ +// Copyright (c) 2023 Cesanta Software Limited +// All rights reserved + +#define LED PICO_DEFAULT_LED_PIN + +static inline int gpio_read(uint16_t pin) { + return gpio_get_out_level(pin); +} +static inline void gpio_write(uint16_t pin, bool val) { + gpio_put(pin, val); +} diff --git a/examples/rp2040/pico-rndis-device/main.c b/examples/rp2040/pico-rndis-device/main.c new file mode 100644 index 0000000000..08de97ccb0 --- /dev/null +++ b/examples/rp2040/pico-rndis-device/main.c @@ -0,0 +1,89 @@ +// Copyright (c) 2022 Cesanta Software Limited +// All rights reserved + +#include "mongoose.h" +#include "net.h" +#include "pico/stdlib.h" +#include "tusb.h" + +bool hal_gpio_read(int pin) { + return (pin >= 0 && pin <= 29) ? gpio_get_out_level((uint) pin) : false; +} + +void hal_gpio_write(int pin, bool val) { + if (pin >= 0 && pin <= 29) gpio_put((uint) pin, val); +} + +int hal_led_pin(void) { + return PICO_DEFAULT_LED_PIN; +} + +static struct mg_tcpip_if *s_ifp; + +const uint8_t tud_network_mac_address[6] = {2, 2, 0x84, 0x6A, 0x96, 0}; + +bool tud_network_recv_cb(const uint8_t *buf, uint16_t len) { + mg_tcpip_qwrite((void *) buf, len, s_ifp); + // MG_INFO(("RECV %hu", len)); + // mg_hexdump(buf, len); + tud_network_recv_renew(); + return true; +} + +void tud_network_init_cb(void) { +} + +uint16_t tud_network_xmit_cb(uint8_t *dst, void *ref, uint16_t arg) { + // MG_INFO(("SEND %hu", arg)); + memcpy(dst, ref, arg); + return arg; +} + +static size_t usb_tx(const void *buf, size_t len, struct mg_tcpip_if *ifp) { + if (!tud_ready()) return 0; + while (!tud_network_can_xmit(len)) tud_task(); + tud_network_xmit((void *) buf, len); + (void) ifp; + return len; +} + +static bool usb_up(struct mg_tcpip_if *ifp) { + (void) ifp; + return tud_inited() && tud_ready() && tud_connected(); +} + +static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_dta) { + if (ev == MG_EV_HTTP_MSG) return mg_http_reply(c, 200, "", "ok\n"); +} + +int main(void) { + gpio_init(PICO_DEFAULT_LED_PIN); + gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT); + stdio_init_all(); + + struct mg_mgr mgr; // Initialise Mongoose event manager + mg_mgr_init(&mgr); // and attach it to the interface + + struct mg_tcpip_driver driver = {.tx = usb_tx, .up = usb_up}; + struct mg_tcpip_if mif = {.mac = {2, 0, 1, 2, 3, 0x77}, + .ip = mg_htonl(MG_U32(192, 168, 3, 1)), + .mask = mg_htonl(MG_U32(255, 255, 255, 0)), + .enable_dhcp_server = true, + .enable_get_gateway = true, + .driver = &driver, + .recv_queue.size = 4096}; + s_ifp = &mif; + mg_tcpip_init(&mgr, &mif); + tusb_init(); + + MG_INFO(("Initialising application...")); + web_init(&mgr); + + MG_INFO(("Starting event loop")); + for (;;) { + mg_mgr_poll(&mgr, 0); + tud_task(); + } + + return 0; +} diff --git a/examples/rp2040/pico-rndis-device/mongoose.c b/examples/rp2040/pico-rndis-device/mongoose.c new file mode 120000 index 0000000000..5e522bbcd4 --- /dev/null +++ b/examples/rp2040/pico-rndis-device/mongoose.c @@ -0,0 +1 @@ +../../../mongoose.c \ No newline at end of file diff --git a/examples/rp2040/pico-rndis-device/mongoose.h b/examples/rp2040/pico-rndis-device/mongoose.h new file mode 120000 index 0000000000..ee4ac82323 --- /dev/null +++ b/examples/rp2040/pico-rndis-device/mongoose.h @@ -0,0 +1 @@ +../../../mongoose.h \ No newline at end of file diff --git a/examples/rp2040/pico-rndis-device/net.c b/examples/rp2040/pico-rndis-device/net.c new file mode 120000 index 0000000000..39be7659ac --- /dev/null +++ b/examples/rp2040/pico-rndis-device/net.c @@ -0,0 +1 @@ +../../mqtt-dashboard/device/net.c \ No newline at end of file diff --git a/examples/rp2040/pico-rndis-device/net.h b/examples/rp2040/pico-rndis-device/net.h new file mode 120000 index 0000000000..cb6bd99fed --- /dev/null +++ b/examples/rp2040/pico-rndis-device/net.h @@ -0,0 +1 @@ +../../mqtt-dashboard/device/net.h \ No newline at end of file diff --git a/examples/rp2040/pico-rndis-device/netif/ethernet.h b/examples/rp2040/pico-rndis-device/netif/ethernet.h new file mode 100644 index 0000000000..d48aeb141c --- /dev/null +++ b/examples/rp2040/pico-rndis-device/netif/ethernet.h @@ -0,0 +1,2 @@ +#pragma once +#define SIZEOF_ETH_HDR 14 diff --git a/examples/rp2040/pico-rndis-device/tusb_config.h b/examples/rp2040/pico-rndis-device/tusb_config.h new file mode 100644 index 0000000000..7aef1f2f1c --- /dev/null +++ b/examples/rp2040/pico-rndis-device/tusb_config.h @@ -0,0 +1,9 @@ +#pragma once + +// Windows only supports RNDIS +// Mac only supports CDC-ECM +// Linux supports either RNDIS, CDC-ECM or CDC-NCM +#define CFG_TUD_ECM_RNDIS 1 +#define BOARD_DEVICE_RHPORT_NUM 0 +#define BOARD_DEVICE_RHPORT_SPEED OPT_MODE_FULL_SPEED +#define CFG_TUSB_RHPORT0_MODE (OPT_MODE_DEVICE | BOARD_DEVICE_RHPORT_SPEED) diff --git a/examples/rp2040/pico-rndis-device/usb_descriptors.c b/examples/rp2040/pico-rndis-device/usb_descriptors.c new file mode 100644 index 0000000000..bee51790ab --- /dev/null +++ b/examples/rp2040/pico-rndis-device/usb_descriptors.c @@ -0,0 +1,248 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2019 Ha Thach (tinyusb.org) + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + * + */ + +#include "tusb.h" + +/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug. + * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC. + * + * Auto ProductID layout's Bitmap: + * [MSB] NET | VENDOR | MIDI | HID | MSC | CDC [LSB] + */ +#define _PID_MAP(itf, n) ( (CFG_TUD_##itf) << (n) ) +#define USB_PID (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \ + _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) | _PID_MAP(ECM_RNDIS, 5) | _PID_MAP(NCM, 5) ) + +// String Descriptor Index +enum +{ + STRID_LANGID = 0, + STRID_MANUFACTURER, + STRID_PRODUCT, + STRID_SERIAL, + STRID_INTERFACE, + STRID_MAC +}; + +enum +{ + ITF_NUM_CDC = 0, + ITF_NUM_CDC_DATA, + ITF_NUM_TOTAL +}; + +enum +{ +#if CFG_TUD_ECM_RNDIS + CONFIG_ID_RNDIS = 0, + CONFIG_ID_ECM = 1, +#else + CONFIG_ID_NCM = 0, +#endif + CONFIG_ID_COUNT +}; + +//--------------------------------------------------------------------+ +// Device Descriptors +//--------------------------------------------------------------------+ +tusb_desc_device_t const desc_device = +{ + .bLength = sizeof(tusb_desc_device_t), + .bDescriptorType = TUSB_DESC_DEVICE, + .bcdUSB = 0x0200, + + // Use Interface Association Descriptor (IAD) device class + .bDeviceClass = TUSB_CLASS_MISC, + .bDeviceSubClass = MISC_SUBCLASS_COMMON, + .bDeviceProtocol = MISC_PROTOCOL_IAD, + + .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE, + + .idVendor = 0xCafe, + .idProduct = USB_PID, + .bcdDevice = 0x0101, + + .iManufacturer = STRID_MANUFACTURER, + .iProduct = STRID_PRODUCT, + .iSerialNumber = STRID_SERIAL, + + .bNumConfigurations = CONFIG_ID_COUNT // multiple configurations +}; + +// Invoked when received GET DEVICE DESCRIPTOR +// Application return pointer to descriptor +uint8_t const * tud_descriptor_device_cb(void) +{ + return (uint8_t const *) &desc_device; +} + +//--------------------------------------------------------------------+ +// Configuration Descriptor +//--------------------------------------------------------------------+ +#define MAIN_CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_RNDIS_DESC_LEN) +#define ALT_CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_ECM_DESC_LEN) +#define NCM_CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_NCM_DESC_LEN) + +#if CFG_TUSB_MCU == OPT_MCU_LPC175X_6X || CFG_TUSB_MCU == OPT_MCU_LPC177X_8X || CFG_TUSB_MCU == OPT_MCU_LPC40XX + // LPC 17xx and 40xx endpoint type (bulk/interrupt/iso) are fixed by its number + // 0 control, 1 In, 2 Bulk, 3 Iso, 4 In etc ... + #define EPNUM_NET_NOTIF 0x81 + #define EPNUM_NET_OUT 0x02 + #define EPNUM_NET_IN 0x82 + +#elif CFG_TUSB_MCU == OPT_MCU_SAMG || CFG_TUSB_MCU == OPT_MCU_SAMX7X + // SAMG & SAME70 don't support a same endpoint number with different direction IN and OUT + // e.g EP1 OUT & EP1 IN cannot exist together + #define EPNUM_NET_NOTIF 0x81 + #define EPNUM_NET_OUT 0x02 + #define EPNUM_NET_IN 0x83 + +#else + #define EPNUM_NET_NOTIF 0x81 + #define EPNUM_NET_OUT 0x02 + #define EPNUM_NET_IN 0x82 +#endif + +#if CFG_TUD_ECM_RNDIS + +static uint8_t const rndis_configuration[] = +{ + // Config number (index+1), interface count, string index, total length, attribute, power in mA + TUD_CONFIG_DESCRIPTOR(CONFIG_ID_RNDIS+1, ITF_NUM_TOTAL, 0, MAIN_CONFIG_TOTAL_LEN, 0, 100), + + // Interface number, string index, EP notification address and size, EP data address (out, in) and size. + TUD_RNDIS_DESCRIPTOR(ITF_NUM_CDC, STRID_INTERFACE, EPNUM_NET_NOTIF, 8, EPNUM_NET_OUT, EPNUM_NET_IN, CFG_TUD_NET_ENDPOINT_SIZE), +}; + +static uint8_t const ecm_configuration[] = +{ + // Config number (index+1), interface count, string index, total length, attribute, power in mA + TUD_CONFIG_DESCRIPTOR(CONFIG_ID_ECM+1, ITF_NUM_TOTAL, 0, ALT_CONFIG_TOTAL_LEN, 0, 100), + + // Interface number, description string index, MAC address string index, EP notification address and size, EP data address (out, in), and size, max segment size. + TUD_CDC_ECM_DESCRIPTOR(ITF_NUM_CDC, STRID_INTERFACE, STRID_MAC, EPNUM_NET_NOTIF, 64, EPNUM_NET_OUT, EPNUM_NET_IN, CFG_TUD_NET_ENDPOINT_SIZE, CFG_TUD_NET_MTU), +}; + +#else + +static uint8_t const ncm_configuration[] = +{ + // Config number (index+1), interface count, string index, total length, attribute, power in mA + TUD_CONFIG_DESCRIPTOR(CONFIG_ID_NCM+1, ITF_NUM_TOTAL, 0, NCM_CONFIG_TOTAL_LEN, 0, 100), + + // Interface number, description string index, MAC address string index, EP notification address and size, EP data address (out, in), and size, max segment size. + TUD_CDC_NCM_DESCRIPTOR(ITF_NUM_CDC, STRID_INTERFACE, STRID_MAC, EPNUM_NET_NOTIF, 64, EPNUM_NET_OUT, EPNUM_NET_IN, CFG_TUD_NET_ENDPOINT_SIZE, CFG_TUD_NET_MTU), +}; + +#endif + +// Configuration array: RNDIS and CDC-ECM +// - Windows only works with RNDIS +// - MacOS only works with CDC-ECM +// - Linux will work on both +static uint8_t const * const configuration_arr[2] = +{ +#if CFG_TUD_ECM_RNDIS + [CONFIG_ID_RNDIS] = rndis_configuration, + [CONFIG_ID_ECM ] = ecm_configuration +#else + [CONFIG_ID_NCM ] = ncm_configuration +#endif +}; + +// Invoked when received GET CONFIGURATION DESCRIPTOR +// Application return pointer to descriptor +// Descriptor contents must exist long enough for transfer to complete +uint8_t const * tud_descriptor_configuration_cb(uint8_t index) +{ + return (index < CONFIG_ID_COUNT) ? configuration_arr[index] : NULL; +} + +//--------------------------------------------------------------------+ +// String Descriptors +//--------------------------------------------------------------------+ + +// array of pointer to string descriptors +static char const* string_desc_arr [] = +{ + [STRID_LANGID] = (const char[]) { 0x09, 0x04 }, // supported language is English (0x0409) + [STRID_MANUFACTURER] = "TinyUSB", // Manufacturer + [STRID_PRODUCT] = "TinyUSB Device", // Product + [STRID_SERIAL] = "123456", // Serial + [STRID_INTERFACE] = "TinyUSB Network Interface" // Interface Description + + // STRID_MAC index is handled separately +}; + +static uint16_t _desc_str[32]; + +// Invoked when received GET STRING DESCRIPTOR request +// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete +uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid) +{ + (void) langid; + + unsigned int chr_count = 0; + + if (STRID_LANGID == index) + { + memcpy(&_desc_str[1], string_desc_arr[STRID_LANGID], 2); + chr_count = 1; + } + else if (STRID_MAC == index) + { + // Convert MAC address into UTF-16 + + for (unsigned i=0; i> 4) & 0xf]; + _desc_str[1+chr_count++] = "0123456789ABCDEF"[(tud_network_mac_address[i] >> 0) & 0xf]; + } + } + else + { + // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors. + // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors + + if ( !(index < sizeof(string_desc_arr)/sizeof(string_desc_arr[0])) ) return NULL; + + const char* str = string_desc_arr[index]; + + // Cap at max char + chr_count = (uint8_t) strlen(str); + if ( chr_count > (TU_ARRAY_SIZE(_desc_str) - 1)) chr_count = TU_ARRAY_SIZE(_desc_str) - 1; + + // Convert ASCII string into UTF-16 + for (unsigned int i=0; idhcp->magic; res.xid = pkt->dhcp->xid; - // memcpy(ifp->gwmac, pkt->eth->src, sizeof(ifp->gwmac)); + if (ifp->enable_get_gateway) { + ifp->gw = res.yiaddr; + memcpy(ifp->gwmac, pkt->eth->src, sizeof(ifp->gwmac)); + } tx_udp(ifp, pkt->eth->src, ifp->ip, mg_htons(67), op == 1 ? ~0U : res.yiaddr, mg_htons(68), &res, sizeof(res)); } diff --git a/mongoose.h b/mongoose.h index 9b9ca5909c..4c29121514 100644 --- a/mongoose.h +++ b/mongoose.h @@ -1873,6 +1873,7 @@ struct mg_tcpip_if { struct mg_str tx; // Output (TX) buffer bool enable_dhcp_client; // Enable DCHP client bool enable_dhcp_server; // Enable DCHP server + bool enable_get_gateway; // DCHP server sets client as gateway bool enable_crc32_check; // Do a CRC check on RX frames and strip it bool enable_mac_check; // Do a MAC check on RX frames struct mg_tcpip_driver *driver; // Low level driver diff --git a/src/net_builtin.c b/src/net_builtin.c index ec1d50b9d6..66ba23669a 100644 --- a/src/net_builtin.c +++ b/src/net_builtin.c @@ -450,7 +450,10 @@ static void rx_dhcp_server(struct mg_tcpip_if *ifp, struct pkt *pkt) { memcpy(&res.options, opts, sizeof(opts)); res.magic = pkt->dhcp->magic; res.xid = pkt->dhcp->xid; - // memcpy(ifp->gwmac, pkt->eth->src, sizeof(ifp->gwmac)); + if (ifp->enable_get_gateway) { + ifp->gw = res.yiaddr; + memcpy(ifp->gwmac, pkt->eth->src, sizeof(ifp->gwmac)); + } tx_udp(ifp, pkt->eth->src, ifp->ip, mg_htons(67), op == 1 ? ~0U : res.yiaddr, mg_htons(68), &res, sizeof(res)); } diff --git a/src/net_builtin.h b/src/net_builtin.h index 762f670f73..6ddc199478 100644 --- a/src/net_builtin.h +++ b/src/net_builtin.h @@ -21,6 +21,7 @@ struct mg_tcpip_if { struct mg_str tx; // Output (TX) buffer bool enable_dhcp_client; // Enable DCHP client bool enable_dhcp_server; // Enable DCHP server + bool enable_get_gateway; // DCHP server sets client as gateway bool enable_crc32_check; // Do a CRC check on RX frames and strip it bool enable_mac_check; // Do a MAC check on RX frames struct mg_tcpip_driver *driver; // Low level driver